<template>
  <div>
    <!-- 面包屑导航 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图 -->
    <el-card>
        <!-- 警告区域 -->
        <el-alert show-icon title="注意：只允许第三级分类设置相关参数" type="warning"
         :closable="false"></el-alert>

        <el-row class="cat_opt">
            <el-col>
                <span>选择商品分类：</span>
                 <!--选择商品分类的级联选择框  -->
                 <el-cascader
                    v-model="selectedCateKeys"
                    props.expandTrigger
                    :options="catelist"
                    :props="cateProps"
                    @change="handleChange">
                </el-cascader>
            </el-col>
        </el-row>
       
       <!-- tab页签区域 -->
        <el-tabs v-model="activeName" @tab-click="handleTabClick" >
            <!-- 添加动态参数的面板 -->
            <el-tab-pane label="动态参数" name="many" >
                <!-- 添加参数的按钮 -->
                <el-button type="primary" size="mini"
                 :disabled="isBtnDisabled" @click="addDialogVisible = true">添加参数</el-button>
                <!-- 动态参数表格 -->
                <el-table :data="manyTableData" border stripe>
                    <!-- 展开列 -->
                    <el-table-column type="expand">
                        <template slot-scope="scope"> 
                            <!-- 循环渲染tag标签 -->
                            <el-tag v-for="(item,i) in scope.row.attr_vals"
                             :key="i" closable @close="handleClose(i,scope.row)">{{item}}</el-tag>
                             <!-- 输入文本框 -->
                             <el-input
                                class="input-new-tag"
                                v-if="scope.row.inputVisible"
                                v-model="scope.row.inputValue"
                                ref="saveTagInput"
                                size="small"
                                @keyup.enter.native="handleInputConfirm(scope.row)"
                                @blur="handleInputConfirm(scope.row)"
                            >
                            </el-input>

                             <!-- 添加按钮 -->
                            <el-button v-else class="button-new-tag"
                             size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                            
                        </template>
                    </el-table-column>
                    <!-- 索引列 -->
                    <el-table-column type="index" ></el-table-column>
                    <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                    <el-table-column label="操作" >
                        <template slot-scope="scope">
                            <el-button size="mini" type="primary"
                             icon="el-icon-edit" 
                             @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                            <el-button size="mini" type="danger"
                             icon="el-icon-delete"  @click="removeParams(scope.row.attr_id)">删除</el-button>
                        </template>
                    </el-table-column>
                </el-table>

            </el-tab-pane>
            <!-- 添加静态属性的面板 -->
            <el-tab-pane label="静态属性" name="only">
                <el-button type="primary" size="mini" 
                :disabled="isBtnDisabled"  @click="addDialogVisible = true" >添加属性</el-button>
                <!-- 静态属性表格 -->
                <el-table :data="onlyTableData" border stripe>
                    <!-- 展开列 -->
                   <el-table-column type="expand">
                        <template slot-scope="scope"> 
                            <!-- 循环渲染tag标签 -->
                            <el-tag v-for="(item,i) in scope.row.attr_vals"
                             :key="i" closable @close="handleClose(i,scope.row)">{{item}}</el-tag>
                             <!-- 输入文本框 -->
                             <el-input
                                class="input-new-tag"
                                v-if="scope.row.inputVisible"
                                v-model="scope.row.inputValue"
                                ref="saveTagInput"
                                size="small"
                                @keyup.enter.native="handleInputConfirm(scope.row)"
                                @blur="handleInputConfirm(scope.row)"
                            >
                            </el-input>

                             <!-- 添加按钮 -->
                            <el-button v-else class="button-new-tag"
                             size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                            
                        </template>
                    </el-table-column>
                    <!-- 索引列 -->
                    <el-table-column type="index" ></el-table-column>
                    <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                    <el-table-column label="操作" >
                        <template slot-scope="scope">
                            <el-button size="mini" type="primary"
                             icon="el-icon-edit"
                              @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                            <el-button size="mini" type="danger"
                             icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
                        </template>
                    </el-table-column>
                </el-table>
            </el-tab-pane>
            
        </el-tabs>    

    
    </el-card>

    <!-- 添加参数的对话框 -->
    <el-dialog
    :title="'添加'+titleText"
    :visible.sync="addDialogVisible"
    width="50%"
    @close="addDialogClosed"
    >
        <el-form :model="addForm" :rules="addFormRules"
         ref="addFormRef" label-width="100px">
            <el-form-item :label="titleText" prop="attr_name">
                <el-input v-model="addForm.attr_name"></el-input>
            </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
            <el-button @click="addDialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="addParams">确 定</el-button>
        </span>
    </el-dialog>

    <!-- 修改参数的对话框 -->
    <el-dialog
    :title="'修改'+titleText"
    :visible.sync="editDialogVisible"
    width="50%"
    @close="editDialogClosed"
    >
        <el-form :model="editForm" :rules="editFormRules"
         ref="editFormRef" label-width="100px">
            <el-form-item :label="titleText" prop="attr_name">
                <el-input v-model="editForm.attr_name"></el-input>
            </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
            <el-button @click="editDialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="editParams">确 定</el-button>
        </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
    data(){
        return{
            // 商品分类列表
            catelist:[],
            // 级联选择器的配置对象1
            cateProps:{
                value:'cat_id',
                label:'cat_name',
                children:'children'
            },
            // 级联选择器双向绑定到数组
            selectedCateKeys:[],
            // 被激活的页签的名称
            activeName:'many',
            // 动态参数的数据
            manyTableData:[],
            // 动态属性的数据
            onlyTableData:[],
            // 控制添加对话框的显示与隐藏
            addDialogVisible:false,
            // 添加参数的表单数据对象
            addForm:{
                attr_name:''
            },
            // 添加表单的验证规则对象
            addFormRules:{
                attr_name:[
                   { required: true, message: '请输入参数名称', trigger: 'blur' }
                ]
            },
            // 控制修改对话框的显示与隐藏
            editDialogVisible:false,
            // 修改表单的数据对象
            editForm:{

            },
            editFormRules:{
                attr_name:[
                    { required: true, message: '请输入参数名称', trigger: 'blur' }
                ]
            },
            
           

        }
    },
    created(){
        this.getCateList()
    },
    methods:{
        // 获取所有商品分页列表
        async getCateList(){
            const {data:res} = await  this.$http.get('categories' )

            if(res.meta.status !== 200){
                return this.$message.error('获取商品分类失败！')
            }
            this.catelist = res.data
            console.log(this.catelist);

        },
        // 级联选择框选中会变化，会触发这个函数
        handleChange(){
           this.getParamsData()
        },
        // tab 页签点击事件处理的函数
        handleTabClick(){
            console.log(this.activeName);
            this.getParamsData()
        },
        // 获取参数的列表数据
        async getParamsData(){
             // 证明选中的不是三级分类
            if(this.selectedCateKeys.length !== 3){
                this.selectedCateKeys = []
                this.manyTableData = []
                this.onlyTableData = []
                return
            }
            // 证明选中是三级分类
            console.log(this.selectedCateKeys);
            // 根据所分类的id，和当前所处的面板，获取对应的参数
            const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,{
                params:{sel:this.activeName}
            })

            if(res.meta.status!==200){
                return this.$message.error("获取参数列表失败！")
            }

            
            res.data.forEach(item => {
                item.attr_vals = item.attr_vals ?
                item.attr_vals.split(' ') : []
                // 添加布尔值显示文本框显示与隐藏
                item.inputVisible =false
                // 文本框中输入的值
                item.inputValue = ''
            })
            console.log(res.data);
            if(this.activeName === 'many'){
                this.manyTableData = res.data
            }else{
                this.onlyTableData = res.data
            }

        },
        // 监听添加对话框的关闭事件
        addDialogClosed(){
            this.$refs.addFormRef.resetFields()
        },
        // 点击按钮添加数据
        addParams(){
            this.$refs.addFormRef.validate(async valid => {
                if( !valid ) return
                const { data:res } = await this.$http.post(`categories/${this.cateId}/attributes`,{
                    attr_name:this.addForm.attr_name,
                    attr_sel:this.activeName
                })

                if(res.meta.status !== 201){
                    return this.$message.error('添加参数失败')
                }
                this.$message.success('添加参数成功')
                this.addDialogVisible = false
                this.getParamsData()
                
            })

                
            
        },
        // 点击按钮，展示对话框
        async showEditDialog(attr_id){
            // 查询当前参数的些许
            // categories/:id/attributes/:attrId
            const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`,{
                params:{attr_sel:this.activeName}
            })
                if(res.meta.status !== 200){
                    return this.$message.error("修改参数信息失败")
                }

            this.editForm = res.data
             this.editDialogVisible = true
        },
        // 重置修改的表单
        editDialogClosed(){
            this.$refs.editFormRef.resetFields()
        },
        // 点击按钮，修改参数信息
        editParams(){
            this.$refs.editFormRef.validate(async valid => {
                if(!valid) return
                // categories/:id/attributes/:attrId
                const {data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,{
                    attr_name:this.editForm.attr_name,
                    attr_sel:this.activeName
                })

                if(res.meta.status !== 200 ){
                    return this.$message.error('修改参数失败')
                }
                this.$message.success('修改参数成功!')
                this.getParamsData()
                this.editDialogVisible = false
            })
        },
        // 根据id删除对应的参数项
        async removeParams(attr_id){
            const confirmResult =await this.$confirm('此操作将永久删除该文件, 是否继续?', '提示',
              {
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning'
            }).catch(error => error)

            if(confirmResult !== 'confirm'){
                return this.$message.info('已经取消删除')
            }

            // 删除的业务逻辑
            const {data:res} = await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)

            if(res.meta.status!==200){
                return this.$message.error('删除参数失败')
            }

            this.$message.success('删除参数成功')
            this.getParamsData()
        },
        //文本框失去焦点，或按下enter都会触发
        async handleInputConfirm(row){
            // console.log('ok');
            if(row.inputValue.trim().length === 0){
                row.inputValue = ''
                row.inputVisible = false
                return
            }
            // 如果没有return，则证明输入内容需要做后续处理
                row.attr_vals.push(row.inputValue.trim())
                row.inputValue = ''
                row.inputVisible = false
                // 发起请求保存到数据库 put-categories/:id/attributes/:attrId
               this.saveAttrVals(row)
        },
        // 将attr_vals的操作，保存到数据库
        async saveAttrVals(row){
              // 发起请求保存到数据库 put-categories/:id/attributes/:attrId
                const {data:res} = this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,
                {
                    attr_name:row.attr_name,
                    attr_sel:row.attr_sel,
                    attr_vals:row.attr_vals.join(' ')
                })
                    if(res.meta.status !== 200){
                        return this.$message.error("修改参数项失败")
                    }
                     this.$message.success("修改参数项目成功")
        },
        // 点击按钮，显示文本输入框
        showInput(row){
            row.inputVisible = true
            // 让文本框自动获得焦点
            // $nextTick方法的作用，就是页面上元素被重新渲染之后，彩绘指定回调函数中的带啊吗
             this.$nextTick(_ => {
                this.$refs.saveTagInput.$refs.input.focus();
             });
        },
        // 删除对应的参数与选项
        handleClose(i,row){
            row.attr_vals.splice(i,1)
            this.saveAttrVals(row)
        }

    },
     computed:{
        // 
        isBtnDisabled(){
            if(this.selectedCateKeys.length !== 3){
                return true
            }
            return false
        },
        // 当前选中的三级分类Id
        cateId(){
            
            if(this.selectedCateKeys.length == 3){
                return this.selectedCateKeys[2]
            }
            return null
        },
        // 动态计算标题的文本
        titleText(){
            if(this.activeName === 'many'){
                return '动态参数'
            }
                return '静态参数'
        }
    },
};
</script>

<style scoped>
.cat_opt{
    margin-top: 15px;
}
.el-tag{
    margin: 15px;
}

  .input-new-tag {
    width: 90px;
    margin-left: 10px;
   
  }
</style>
